Azo coloring-matter.



UNITED STA'EIS PATENT OFFICE.

ARTHUR ZART, OF VOI-IWINKEL, NEAR ELBERFELD, GERMANY, ASSIGNOR TO FARBEN- FABRIKEN VORM. FRIEDR. BAYER & 00., 0F ELBERFELD, GERMANY, A CORPORA- TION OF GERMANY.

AZO COLORING-MATTER.

Patented Apr. 2, 1912.

Renewed February 7, 1912. Serial No.

To all whom it may concern:

Be it known that I, ARTHUR ZART, doctor of philosophy, chemist, citizen of the Ger man Empire, residing at Vohwinkel, near Elberfeld, Germany, have invented new and useful Improvements in New Azo Coloring- Matter, of which the following is a specification.

My invention relates to the manufacture and production of new disazo coloring matters having mostprobably the formula:

l I I I N..N

R and R, meaning an arylcarbonyl-2-amino- 5-naphthol-7-sulfonic acid, such as benzoylor para anisoyl 2-amino-5-naphthol-7-sulfonic acid, etc. Of course two different molecules of these compounds can be used. They are obtained by combining 2 molecules of diazotized 2-aminoarylcarbonylamino-5- naphthol-7-sulfonic acids with the 5.5 dioxy-22 dinaphthylamin 7.7 disult'omc acid.

The new dyes are after being dried and pulverized in the shape of their alkaline salt dark powders easily soluble in water. They yield upon reduction with stannous chlorid and hydrochloric acid an aminoarylcarbonyl-Q-amino-5-naphthol-7-sulfonic acid and 5.5-dioxy-6.6-diamino-2.2-dinaphthylamin-7-7'-disulfonic acid. They dye cotton blue-red shades which can be combined on fiber with diazotized para-nitranilin; from red to Bordeaux shades being thus obtained which are fast to washing and can be discharged to a pure white.

In order to illustrate the new process more fully the following example is given, the parts being by weight:-716 parts of 2- para-aminobenzoylamino-5-naphthol- 7 sulfonic acid are diazotized with 138 parts of sodium nitrite and hydrochloric acid and the resulting diazo compound is combined with a solution of4l61 parts of 5.5-dioxy 2.2-d1naphthylamin-7 .7 -disulfonic acid I I I I I containing an excess of sodium bicarbonate. When the combination is complete the disazo dye is salted out. It is after being dried and pulverized in the shape of its s0- dium salt a dark powder, soluble in Water with a bluish-red color and soluble in concentrated sulfuric acid with a reddish-violet color. By reduction with stannous chlorid and hydrochloric acid the dye is decomposed, 2 para aminobenzoylamino 5- naphthol-7-sulfonic acid and the 5.5-dioxy- 6.6-diamino-2.2'-dinaphthylamin-7 .7 -disulfonic acid are obtained. It dyes cotton bluish-red shades, changing into a fast Bordeaux by development with diazotized paranitranilin. The shade thus obtained is fast to washing and can be discharged to a pure white with hydrosulfite.

The disazo dye obtained from 2-metaaminobenzoylamin0-5 naphthol 7 sulfonic acid dyes cotton red yielding a bluish-red by developing the dyed fiber with diazotized' para-nitranilin. On using meta-amino-paraanisoyl-2-amino-5-naphthol-7-sulfonic acid somewhat more bluish shades are obtained.

I claim 1. The herein described new disazo dyestuffs having most probably the formula:

/\AMA/M...

R and R meaning 2-arylcarbonylamino-5- naphthol-7-sulfonic acid, which are after being dried and pulverized in the shape of their alkaline salts dark powders easily soluble in water; yielding upon reduction with stannous chlorid and hydrochloric acid an aminoarylcarbonyl-2-a1nino-5-naphthol- 7-sulfonic acid and 5.5-dioXy-6.6-diamino- 2.2 dinaphthylamin 7 .7 disulfonic acid, dyeing cotton blue-red shades which can be combined on fiber with diazotized para-nitranilin from red to Bordeaux shadeswhich are fast to washing and can be discharged to a pure white, substantially as described.

2. The herein described new disazo dyestuif having most probably the formula:

R meaning EZ-benzoylamino-5-naphthol-7- sulfonic acid, which is after being dried and pulverized in the shape of its sodium salt a dark powder, soluble in water with a bluish-red color and soluble in concentrated sulfuric acid with a reddish-violet color; yielding upon reduction with stannous chlorid and hydrochloric acid 2-para-aminobenzoylalnino 5 naphthol 7 -sulfonic acid and 5.5-dioXy-6.6-dia-mino-22-dinaphthyla1nin-7 .7 -disulfonic acid; dyeing cotton bluish-red shades, changing into a fast Bordeaux by development with diazotized para-nitranilin which are fast to washing and can be discharged to a pure white with hydrosul iite, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ARTHUR ZART.

VVitnes'ses:

ALBERT F. NUFER, ALFRED IIENKEL;

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington; D. C. 

